Summary
Removing fish faster than populations can recover, leading to stock collapse.
In depth
About a third of assessed stocks are overfished. Bycatch kills turtles, dolphins and seabirds. Collapse of Newfoundland cod in 1992 caused huge job losses. Solutions: quotas, gear limits, MPAs and certification (MSC).
Management shifts from single-species to ecosystem approaches. Fishery subsidies encourage overcapacity. Aquaculture now supplies about half of fish for food.
Key idea: sustainable fishing takes fish no faster than stocks regrow.
Overfishing means catching fish faster than stocks can reproduce, reducing populations below levels that can produce maximum sustainable yield. About a third of assessed global fish stocks are overfished.
Causes include large industrial fleets, subsidies, illegal and unreported fishing, and destructive gear such as bottom trawls; bycatch kills turtles, seabirds and dolphins. Effects are collapse (Atlantic cod off Newfoundland in 1992), loss of larger fish, fishing down the food web and damage to habitats and coastal livelihoods.
Solutions include catch limits, gear rules, closed seasons, protected areas and traceability.
Key idea: sustainable fisheries management can allow stocks to recover, as shown by several US and EU species.
Frequently asked questions
What is Overfishing?
Removing fish faster than populations can recover, leading to stock collapse.
Which area of biology covers Overfishing, and how advanced is it?
Overfishing is one of the 54 topics in Marine & Environmental Biology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Fisheries Management, Deforestation, Marine Protected Areas.
Can you give an example of Overfishing?
Bluefin tuna stocks fell greatly and have partially recovered with management.
What should I learn before Overfishing?
Work through the Beginner topics in Marine & Environmental Biology first, such as Oceans, Ocean Zones, Plankton, then return to Overfishing. Intermediate topics assume the Beginner vocabulary.
What topics are related to Overfishing?
The closest topics to Overfishing are Fisheries Management, Deforestation, Marine Protected Areas, Upwelling. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Overfishing?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Overfishing. To practise the whole of Marine & Environmental Biology, use the Marine & Environmental Biology quiz.
How is Overfishing different from Fisheries Management?
Overfishing: Removing fish faster than populations can recover, leading to stock collapse. Fisheries Management: Quotas, size limits and maximum sustainable yield models try to keep stocks productive. Read both side by side and note what each one explains.
How should I study Overfishing step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Fisheries Management and explain the difference aloud. Finally, take the Marine & Environmental Biology quiz and come back to this page for any question you miss.